I will share my palette!
My palette is 3 color: black, cyan, yellow (using exact rgb values for them)
Cyan is for sky, yellow is for sun. Black may be for other objects/player in game.
Ditherings: Cyan and yellow can be dithered to make light green, a color for grass. Cyan and black makes color for rain or water. Yellow and black makes dirt or gold.
Image sample of palette: